I can see....
Oracle could (should?) be interested. For a while now they've had OCS (Oracle Collaboration Suite) which has an extremely uninspiring and poor UI.
Now they've got Sun (OpenOffice - competing against MS Office) and BEA AquaLogic (Enterprise Web 2.0 portal - competing against Sharepoint). They could finally offer a real alternative to a large part of the Microsoft stack (Office, Exchange, Sharepoint).
C'mon ole' Lawrence... you know you wanna...